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Proceedings Paper

Laboratory demonstrations of multi-object adaptive optics in the visible on a 10 meter telescope
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Paper Abstract

We have demonstrated MOAO-type atmospheric compensation on a 10 meter telescope at visible wavelengths with the UCO/Lick MCAO/MOAO testbed in the Laboratory for Adaptive Optics at UCSC. We report Strehls of ~20% in R band (658 nm) on-axis and Strehls of ~15% off-axis 25" for a 3D Mauna Kea-type atmosphere with r0 = 15 cm and &Tgr;0 = 3.5". We show that a tomographic MOAO approach with 5 LGS's in a 50" constellation is sufficient to realize good correction in the visible. Two major improvements to the testbed realized this gain: (1) An upgrade to 64x64 subapertures across a 10 meter pupil (2) and a predictor-corrector wind model. We discuss limitations to wide-field visible light AO on 8-10 meter class telescopes and stress that the tomographic error due to blind modes is frequently the largest field-dependent error. We use a predictor-corrector wind model (Wiberg et al. 2006) to take advantage of windlayer shearing in the atmosphere to reduce the tomographic error over a 50" diameter field. Depending on the validity of the Taylor frozen flow model for individual layers in the real atmosphere, this approach could be more effective than increasing the number of LGS's.

Paper Details

Date Published: 16 July 2008
PDF: 10 pages
Proc. SPIE 7015, Adaptive Optics Systems, 70150C (16 July 2008); doi: 10.1117/12.790188
Show Author Affiliations
S. Mark Ammons, Univ. of California, Santa Cruz (United States)
Luke Johnson, Univ. of California, Santa Cruz (United States)
Edward A. Laag, Univ. of California, Riverside (United States)
Renate Kupke, Univ. of California, Santa Cruz (United States)
Donald T. Gavel, Univ. of California, Santa Cruz (United States)

Published in SPIE Proceedings Vol. 7015:
Adaptive Optics Systems
Norbert Hubin; Claire E. Max; Peter L. Wizinowich, Editor(s)

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